International Research Journal of Innovations in Engineering and Technology - IRJIET International Open Access, Monthly, Peer Reviewed, Reputed Journal ISSN (online): 2581-3048

Impact Factor (2025): 6.9

DOI Prefix: 10.47001/IRJIET

Study on the Effect of Coal Blending Quality on the Performance of the XYZ 815 NMW Supercritical Power Plant

Abstract

A Supercritical Power Plant with a maximum capacity of 815 NMW faces a shortage of coal supply that meets boiler specifications. Therefore, coal blending with other types of coal is required to maintain operational continuity for one year. This study analyzes the impact of blending three types of coal on the performance of the power generation through laboratory tests, including proximate, ultimate, and ash analysis. Based on the laboratory results, performed coal blending at specific ratios and analyzed for slagging and fouling potential while being filtered against technical limitations. Five coal blending ratios that met the criteria were tested through direct firing in the boiler at a 790 NMW load to assess the impact on environmental, boiler cleanliness, unit efficiency, and cost savings. The results indicate that an increase in silica, and aluminum content in specific blends improved boiler cleanliness by up to 2%, while other blending ratios reduced cleanliness with the increase in ash content. Four coal blends improved boiler efficiency up to 3.1%, attributed to sustained boiler cleanliness and an increase in the blended coal's Gross Calorific Value (GCV), resulting in a reduction of total fuel flow. Consequently, unit efficiency also improved, with a decrease in NPHR of 61.05 kcal/kWh. Cost analysis revealed potential savings of up to IDR 42 billion per year from coal consumption and carbon tax reductions. Additionally, flue gas emissions and wastewater quality from all coal blending ratios remained within the limits set by the Ministry of Environment.

Country : Indonesia

1 Wishnu Ariyanto2 Endang Kusdiyantini3 Sulardjaka

  1. Master of Energy, Postgraduate School, Diponegoro University, Indonesia
  2. Department of Biology, Faculty of Science and Mathematics, Diponegoro University, Indonesia
  3. Mechanical Engineering Department, Faculty of Engineering, Diponegoro University, Indonesia

IRJIET, Volume 9, Issue 5, May 2025 pp. 466-482

doi.org/10.47001/IRJIET/2025.905053

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